diff --git a/src/gateware/zc706.py b/src/gateware/zc706.py
index 3b304d9..d1ad658 100755
--- a/src/gateware/zc706.py
+++ b/src/gateware/zc706.py
@@ -656,6 +656,21 @@ class _CXP_FMC_RTIO():
     def __init__(self):
         platform = self.platform
         platform.add_extension(coaxpress_4r.fmc_adapter_io)
+        platform.add_extension(leds_fmc33)
+
+        rtio_channels = []
+        # FIXME remove this placeholder RTIO channel
+        # There are too few RTIO channels and cannot be compiled (adr width issue of the lane distributor)
+        # see https://github.com/m-labs/artiq/pull/2158 for similar issue
+        print("USER LED at RTIO channel 0x{:06x}".format(len(rtio_channels)))
+        phy = ttl_simple.Output(self.platform.request("user_led_33", 0))
+        self.submodules += phy
+        rtio_channels.append(rtio.Channel.from_phy(phy))
+        self.config["HAS_RTIO_LOG"] = None
+        rtio_channels.append(rtio.LogChannel())
+
+        self.config["RTIO_LOG_CHANNEL"] = len(rtio_channels)
+        self.add_rtio(rtio_channels)
 
 class NIST_CLOCK(ZC706, _NIST_CLOCK_RTIO):
     def __init__(self, acpki, drtio100mhz):